/*
 * BEEM is a videoconference application on the Android Platform.
 * Copyright (C) 2009 by Frederic-Charles Barthelery,
 * Jean-Manuel Da Silva,
 * Nikita Kozlov,
 * Philippe Lago,
 * Jean Baptiste Vergely,
 * Vincent Veronis.
 * This file is part of BEEM.
 * BEEM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * BEEM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with BEEM. If not, see <http://www.gnu.org/licenses/>.
 * Please send bug reports with examples or suggestions to
 * contact@beem-project.com or http://dev.beem-project.com/
 * Epitech, hereby disclaims all copyright interest in the program "Beem"
 * written by Frederic-Charles Barthelery,
 * Jean-Manuel Da Silva,
 * Nikita Kozlov,
 * Philippe Lago,
 * Jean Baptiste Vergely,
 * Vincent Veronis.
 * Nicolas Sadirac, November 26, 2009
 * President of Epitech.
 * Flavien Astraud, November 26, 2009
 * Head of the EIP Laboratory.
 */

package com.beem.project.beem.service;

import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.Log;

import com.beem.project.beem.smack.avatar.AvatarManager;
import com.beem.project.beem.smack.avatar.AvatarCache;
import com.beem.project.beem.smack.avatar.AvatarMetadataExtension;

import java.security.NoSuchAlgorithmException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import com.beem.project.beem.smack.pep.PepSubManager;
import org.jivesoftware.smack.Connection;

/**
 * An AvatarManager for Beem.
 * It allows to publish avatar on the Android platform.
 */
public class BeemAvatarManager extends AvatarManager {

	private static final String TAG = BeemAvatarManager.class.getSimpleName();
	private static final int JPEG_QUALITY = 100;

	private Context mContext;

	/**
	 * Create a BeemAvatarManager.
	 * 
	 * @param ctx
	 *            the Android context
	 * @param con
	 *            the connection
	 * @param pepMgr
	 *            the PepSubManager of the connection
	 * @param cache
	 *            the cache which will store the avatars
	 * @param autoDownload
	 *            tre to enable auto download of avatars
	 */
	public BeemAvatarManager(final Context ctx, final Connection con, final PepSubManager pepMgr,
			final AvatarCache cache, final boolean autoDownload) {
		super(con, pepMgr, cache, autoDownload);
		mContext = ctx;
	}

	/**
	 * Publish an avatar.
	 * 
	 * @param avatarUri
	 *            the uri of the avatar
	 * @return true if the avatar was successfully published
	 */
	public boolean publishAvatar(Uri avatarUri) {
		try {
			Bitmap bmp = MediaStore.Images.Media.getBitmap(mContext.getContentResolver(), avatarUri);
			return publishAvatar(bmp);
		} catch (IOException e) {
			Log.d(TAG, "Error while publishing avatar " + avatarUri, e);
		}
		return false;
	}

	/**
	 * Publish an avatar.
	 * This will send the XMPP stanza to enable the publication of an avatar.
	 * 
	 * @param bitmap
	 *            the avatar to publish
	 * @return true on success false otherwise
	 */
	private boolean publishAvatar(Bitmap bitmap) {
		// TODO use the metadata available in the mediastore
		AvatarMetadataExtension meta = new AvatarMetadataExtension();
		// Probably a bug on prosody but only the last data sent is kept
		// and in beem we retrieve the first info
		AvatarMetadataExtension.Info jpeg = publishBitmap(bitmap, Bitmap.CompressFormat.JPEG, JPEG_QUALITY);
		// The png format is mandatory for interoperability
		AvatarMetadataExtension.Info png = publishBitmap(bitmap, Bitmap.CompressFormat.PNG, JPEG_QUALITY);
		if (png == null) return false;
		meta.addInfo(png);
		if (jpeg != null) meta.addInfo(jpeg);
		publishAvatarMetaData(png.getId(), meta);
		return true;
	}

	/**
	 * Send this bitmap to the avatar data node of the pep server.
	 * 
	 * @param bmp
	 *            the avatar bitmap
	 * @param format
	 *            the image format to publish this data
	 * @param quality
	 *            the compression quality use for JPEG compression
	 * @return the resulting info associate with this bitmap. null if the operation failed
	 */
	private AvatarMetadataExtension.Info publishBitmap(Bitmap bmp, Bitmap.CompressFormat format, int quality) {
		try {
			byte[] data = getBitmapByte(bmp, format, quality);
			String dataid = getAvatarId(data);
			if (!publishAvatarData(data)) return null;
			String mimetype = "image/png";
			if (Bitmap.CompressFormat.JPEG == format) mimetype = "image/jpeg";
			AvatarMetadataExtension.Info info = new AvatarMetadataExtension.Info(dataid, mimetype, data.length);
			info.setHeight(bmp.getHeight());
			info.setWidth(bmp.getWidth());
			return info;
		} catch (NoSuchAlgorithmException ex) {
			return null;
		}
	}

	/**
	 * Convert the bitmap to a byte array.
	 * 
	 * @param bitmap
	 *            the avatar bitmap
	 * @param format
	 *            the resulting image format
	 * @param quality
	 *            the compression quality use for JPEG compression
	 * @return the bitmap data or a array of 0 element on error
	 */
	private byte[] getBitmapByte(Bitmap bitmap, Bitmap.CompressFormat format, int quality) {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		if (bitmap.compress(format, quality, bos)) return bos.toByteArray();
		else return new byte[0];
	}

}
